Question Discussion & Solution

🔑 Key Points

• A functional dependency \( X \rightarrow Y \) means that the value of attribute set X uniquely determines the value of attribute set Y.
• In this relationship, X is called the determinant, and Y is called the dependent.
• This concept is fundamental to understanding and applying database normalization.
• It implies that for any given value of X, there is exactly one corresponding value of Y.

📄 Additional Information

• For example, if in an 'Employee' table, 'Employee ID' determines 'Employee Name', we write it as \( \text{Employee ID} \rightarrow \text{Employee Name} \). Here, 'Employee Name' is functionally dependent on 'Employee ID'.
• Functional dependencies are used to identify potential redundancies and anomalies in a database and are the basis for defining the various normal forms.
• Understanding which attributes determine which others is crucial for correct database design.